Blast-furnace



J. KENNEDY..

BLAST FURNACE.

. APPLICATION FILED SEPT -l5. x919. 1 ,332,84:6. Patented Mar. 2, 1920.

4 SHEETS-SHEET 1.

WITNESS mvzu-ron J. KENNEDY. BLAST FURNACE.

APPLICATIONFILED SUN-15.1919. v

Patented Mar. 2,1920;

4 SHEETSSHEET 2.

WITNESS v INVENTOH n 1. KENNEDY. BLAST FURNACE.

APPLICAIION HLED SEN-15.1919

Patented Mar. 2, 1920.

4 SHEETS-SHEET 3.

INVENTOR WITNSS WWW J. KENNEDY.

BLAST FURNACE.

APPLICA'IION HLED SEPI- I5. 1919.

Patented Mar. 2, 1920.

4 $HEETS-SHET 4 INVENTOR 5 WITNESS JULIAN KENNEDY, or PITTSBURGH, PENNSYLVANIA.

BLAST-FURNACE.

Specification of Letters Patent.-

Patented Mar. 2, 1920.

Applicationfiled September 15, 1919. Serial No. 323,941.

To all whom it may concern:

Be it known that I, JULIAN KENNEDY, a citizen of the United States, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Blast-Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming part of this specification.

The present invention relates broadly to blast-furnaces, and more particularly to the intake construction for the clown-comers used in connection therewith. The principal object of the present invention is to so con struct the intakes for the down-comers that the fine material being charged into the furnace will not be drawn into the downcomers.

A further object of the present invention is toprovide each of the intakes with a plurality of intake openings, whereby the total intake area for each of the down-comers is increased, and the velocity of the gases is accordingly diminished, with the result that the gases do not have so great an effect on the ores passing into the furnace from the charging hopper.

A. still further obj ect of the present invention is to produce a travel of the gases in the furnace in a circumferential or tangential directionrather than in a radial direction as has heretofore been the practice.

The foregoing andiother objects, together with their attendant advantages, will be apparent as the invention becomes better understood by reference to the accompanying specification and the drawings forming a part thereof, it being premised that changes may be made in the details of construction Within the scope of the appended claims Without departing from the spirit of the invention.

Figure 1 is a top elevation of a portion of a blast-furnace having my improved downcomer construction applied thereto.

Fig. 1 is a detail sectional view illustrating the action of the intakes for the down comers.

Fig. 2 is a side elevation of the furnace construction illustrated in Fig. 1.

Fig. 3 is an enlarged view, partly in section, illustrating the relative positions of the intakes and the hopper, as Well as the manner of attaching the intakes and elbows to the furnace.

Fig. 4. is a side view of one of the intakes illustrated in Fig. 6.

Fig. 5 is a sectional view on the line VV of Fig. l. I

gig. 6 is an endview of one of the intakes,

an Fig. 7 is a longitudinal sectional view through one of the elbows. In blast-furnaces as heretofore constructed, it has been customary to withdraw the gases from the furnace in a radial line which intersected the passage of the material being charged into the furnace from the charging hopper. This resulted in the carrying off of a considerable amount of fine material through the down-comers. This action was augmented by the comparatively high velocity existing at the intake ends for each of the down-comers, due to the comparatively small diameter of the intake openings. The present invention overcomesthe'se disadvantages as will be more fullyapparent hereinafter.

Referring more particularly to the drawings; I have illustrated in outline a portion of ablast-furnace 2 of any desired construction, having a dome 4. In the present em bodiment the dome 4 is preferablyconstructed of sections comprising plates 5 of cast iron or other suitable material, having a heat insulating packing 6' of asbestos, or the like, therebetween. Carriedby the dome is hopper 7 having a conthe usual charging trolling bell 8 therefor.

According to the present invention, there is provided a series of gas intakes 9 within the furnace, having flanges 1O adaptedto be secured so that they may be readily removed and renewed as may become necessary, by means of bolts 11 passingthrough the flanges 12 of down-comer elbows 14. 'The flanges 12 of these elbows are in turn secured in any desired manner to the plates 5 of the furnace domej A second series of elbows 15 is preferably employed for connecting the elbowsltwith the down-comer branches 16. It will be understood that these downcomer branches 16 lead to anyapproved type of dust collector, not shown. If desired, I

may provide either or both "sets of. the elbows 'l l and 15 with inwardly projecting ribs 17 adapted to prevent or impede the passage of solid particles therethrough.

While I have illustrated four intakes, two of which are connected to each of the downcomer branches, it will be apparent that the number and arrangement of the intakes and the clown-comer branches may be varied at will.

In order to eliminate to as large an extent as possible the objectionable radial flow of the gases within the furnace through the material being charged, I construct the intakes of general T-shape having oppositely projecting intake openings 18 separated by partitions 19, as clearly illustrated in the drawings.

By reference more particularly to Fig. 1, it will be noted that the axes of the intake openings 18 extend at substantially right angles to a diametrical line through the furnace so that they are effective for producing a circumferential or tangential flow of the gases therein in substantially the direction indicated by the arrows A. This travel of the gases has a comparatively negligible effect on the fine material being charged into the furnace. Due to the exten sion of the intake openings 18 in opposite directions, it will be apparent thatthere is produced within the furnace a uniform travel of the gases passing into the downcomers.

It is also very desirable to construct the intakes with the' diameter of each of the openings 18 therein somewhat greater than the diameter of the downcomers at the junction of the elbows, the combined area of the intake openings of, each of the intakes being greater than the area of the down-comer branches. This relative difference in area results in a comparatively low velocity of the gases at the intake whereby there is only a very slight disturbing action on the ores being charged into the furnace. As the gases travel through the elbows their velocity is increased so that the diameter of the down-comers is sufficient to carry ofi all of the gases.

The results produced by the combined action of the relative difl'erences in area and the direction of the travel of the gases within the furnace has been found to be highly advantageous.

I claim:

1'. In a blast furnace, a down-comer, and an intake for said down-comer within the furnace, said intake havingaplurality of intake openings; substantially as described.

2. In a blast furnace, a down-comer, and an intake for said clown-comer having a plurality of oppositely extending intake openings; substantially as described.

8. In a blast furnace, a down-comer, an intake for said down-comer having a plurality of intake openings, said openings having a combined area greater than the area of the down-comer at the point of connection of the intake therewith; substantially as described.

l. In a blast furnace, a clown-comer for carrying away the gases therefrom, and an intake for said down-comer having an intake opening, the axis of said intake openingextending transversely to the diameter of the furnace through said intake; substantially as described.

5. In a blast furnace, a down-comer for carrying away the gases therefrom, and an intake for said down-comer having an intake opening, said opening being effective for producing within the body of the furnace a circumferential movement of the gases; substantially as described.

6. As an article of manufacture, an intake for blast furnaces having intake openings extending transversely to the longitudinal axis of the intake; substantially as described.

7. As an article of manufacture, an intake for blast furnaces having a plurality of oppositely extending intake openings formed therein substantially as described.

8. In a blast furnace, a dome constructed of a plurality of plates having a heat insulating lining therebetween, a down-comer secured thereto, and an intake detachably secured to the down-comer; substantially as described.

9. In a blast furnace, a down-comer and a T-shaped intake for said down-comer;-

substantially as described.

10. In a blast furnace, a down-comer for carrying away the gas therefrom, and an intake for said down-comer having intake openings, the axis of said intake openings extending at substantially right angles to the diameter of the furnace through said intake; substantially as described.

11. As an article of manufacture, an intake for blast furnaces, having an intake opening extending at substantially right angles to the longitudinal axis of the intake; substantially as described.

.12. In a blast furnace, a down-comer adjacent the furnace and a detachable intake for said down-comer extending into the furnace from the downcomer, said intake having a plurality of intake openings within the furnace; substantially as described.

In testimony whereof, I have hereunto set my hand.

JULIAN KENNEDY. 

